The spin valley mixing is an excellent probe of the local symmetry of the quantum dot [1]}, [2]}, [3]}, [4]}.
It is indeed expected that the spin-valley mixing vanishes in the presence of more than one mirror plane in the structure [5]}.
The presence of a hotspot is already the sign of a lower symmetry of the system.
The present quantum dots are formed in the corner of the nanowire, therefore, in absence of local disorder, we expect a single mirror plane with its normal vector along \({x}\) , the nanowire axis.
